Pre-Charge Circuits for Lithium-Ion Battery Packs
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- เผยแพร่เมื่อ 14 พ.ย. 2022
- Pre-charge circuits are an important safety and functional feature for high voltage battery packs. Why is this, and how do these circuits work? In this video, Erik Stafl, President of Stafl Systems, describes the use of pre-charge circuits in high-voltage battery system design.
Pre-charge circuits are used because the power source connected to the battery has a high capacitance. If we did not have a pre-charge circuit, there would be a very large inrush current - upwards of thousands of amps - that can weld contactors shut. We want to avoid this inrush current.
If you are new to battery pack architecture and design, we encourage you to view our previous videos prior to watching this video. Some background in electrical engineering may be helpful for most audiences.
For more information about Stafl Systems and our capability to help with your project, visit staflsystems.com. - วิทยาศาสตร์และเทคโนโลยี
The entire series is super helpful - thanks for creating and sharing these!
What a great series of content Erik is making. Watched it all in one take. Hope there is more to come...
Got to be one of the best / simplest explanations ever for something like that..........awesome work.
I have stuck for this section in our bms research. Thanks a lot for your video!
Amazing. Clean and simple explenation, thank you!
I have been trying to find a good explanation on this, wow, superb!
How to talk about inverters without saying "inverter".
I prefer the feedback from a lightbulb with a proper voltage rating for manual use.
thanks for the video
Simply, thank you
Thanks for the class Mister
Very clear explanation!
Love your engineering knowledge . Thank you !!!
Thank you for sharing, very useful video.
excellent explaination
Thanks for sharing
very well explained.. thanks
These videos are amazing
Thank you sir
Respect from India with true hea❤
Thank you Eric! Can't thank enough for creating such videos!
Also, could you make a video on cell balancing? I have seen other youtube videos on Active Cell balancers. Not sure, if they are implemented by reputed BMS providers?
Eric, thanks a lot for all the videos, they are very understandable and clear, could you, please, also load videos on cell balancing techniques related to EV applications?
That's a very burning question for me at the moment. Thanks for asking this to Eric. I have also asked it in my comment on this video. Let's hope we get a video on this soon.
Thank you so much x
Amazing explanation
really helpful
thanks Eric. Beautiful explanation!! Is there any other capacitive load except invertor that we need to consider for the selection of precharge circuit?
Thank you
man that was good
Very clear explanation sir,,,,
Thanks for your effort to explain this topic.
Thank you❤
Really good videos! Could you make some video about concections type in battery pack : laser welding, spot welding... especially mechanical joint with different type of washer. I think preventing self loosen because of heating is very exciting
excellent
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Interesting video. Pls when there is a pre charge failure, what could be the cause and how to solve it? pls. I have a BYD E6B that has a pre charge failure.
Is there a reason that the main contact switch can't be a power FET with slow initial turn-on time and diode for discharge (powering load)? While then when wanting to charge battery pack another power FET in opposite drain-source direction with another diode (opposite direction) so that both charge/discharge states can be enabled/disabled by BMS?
Your videos are superb and very helpful. Could you explain about the importance in compression of LiFePO4 cells during battery pack manufacturing. I keep finding several literature regarding the benefits of cell compression. However, the battery cell manufacturers provide us with a cell guard for each cell when manufacturing battery packs. When these cell guards are added, the compression of cells cannot be done. Should I add these cell guards, and not compress the cells? or should I not use these cell guards and compress my cells properly?
You mean like hydraulic press compression? Dont do compression of this type..
Hi Eric, is there an expected life of the precharge circuit seeing as it is doing a lot of the heavy lifting.
It doesn't do it for long. You just have to figure it out and spec it to withstand the power, currents, lifetime, etc. It's like a starter in an ICE car: usually it runs once then gets hours to cool off. But you can burn it up if you keep doing it over and over, so you have to detect that and prevent it. If your main contactor doesn't work, your precharge could still be connected and your main load starts, and that's when your precharge can burn up. Happened to me in a radar transmitter.
Wow, that was amazing. I would request you to please upload more detailed topics like you mentioned for future videos.
Thanks again for sharing the knowledge
Hello everyone, first of all, thank you for the explanation. I have a question, is the precharge circuit in the battery pack or included in the converter (inverter) or is it a separate system?
included in invertor
It is supposed to be in the battery.industry standard is to have precharge upstream from the inverter.never expect the inverter to have precharge for inrush protection
@@zachfpv4493thank you.
i'm making something with a 3kw hub motor with 80V batteries so basically a parallel circuit thru a 1000 ohm resister will work.
How can I determine the capacitance of a 48v inverter? Both the battery system I'm building and the inverter I'm buying will be 48 v. Inverter is rated for 3000 Watts.
Open it up and look inside.
How 1000 ohm resistance selected?
Ohm's law.
you really gave me a heart attack. i wish if there is a way to meet you.
Huh!
excellent
simply one of if not the best explanation videos I've seen. Thank you Eric.